Toynbee, Arnold J., author
Oxford University Press, 1966
Buku Teks
Stewart, Valerie, author
McGraw-Hill, 1983
Buku Teks
edited by Richard W. Baker [and others]
Institute of Southeast Asian Studies, 1999
Buku Teks
edited by Susan Hornby, Zoe Clarke
Facet, 2004
Buku Teks
Saaty, Thomas L., author
Praeger, 1990
Buku Teks